Lamp housing



D. CANADY LAMP HOUSING Aug. 8, 1950 Filed Dec. 10, 1946 natlssut l NVENTOR. CDM C'cmacq,

firm/Le;

Patented Aug. 8, 1950 LAMP HOUSING Don LCana-dy, Cincinnati, Ohio, assignor, by mesne assignments,l to The Hobart Manufacturing Company, Troy, hio,'a corporation of Ohio rApplicatonDecember 10, 1946, Serial No. 715,270

2 claims. (ci. 12540-47) This invention relates to a lamp housing for l i an electric light source of the high wattage caliber. Usually, in lamps of this nature which are used primarily in motion picture projectors and slide projectors, the lamp is of a wattage which generates considerable heat and unless suitable means are provided, the housing and parts near the lamp become excessively hot and create unreasonable trouble.

In this type of construction it is usual to incorporate a fan for blowing a stream of air about the lamp bulb, but in the case of high wattage lamps and without shields it is impractical to provide sufiicient air stream to keep the housing cool.

My improved structure provides means for absorbing and reecting the heat whereby the air stream will carry away all the heat and the lamp housing remains practically cool.

The object of my invention is to provide a pair of sleeves about the lamp and between the lamp and the outer housing and the surfaces are so coated that the heat will be absorbed and reected into the air stream.

A further object is to provide means whereby the air can be exhausted from the lamp housing without permitting light to pass into the room where the projector is used.

My invention will be further readily understood from the following description and claims and from the drawings, in which latter;

Fig. 1 is a vertical section of the device, taken in the plane of the line I-I of Fig. 2.

Fig. 2 is a plan view of the lamp housing with certain parts removed and the case broken away to more clearly show the mechanism.

Fig. 3 is a top view of the lamp housing.

Fig. 4 is a vertical section of the battles, taken in the plane of the line 4 4 of Fig. 3.

Fig. 5 is a horizontal section, taken in the plane of the line 5-5 of Fig. 1.

My improved lamp housing is arranged to be attached to a vertical panel II forming part of the projection device. Attached rigidly to this panel is a curved corrugated portion I2 forming the remainder of the lamp housing proper.

Ribs I3 extend from the curved portion of the panels II and corrugated portion I2 and form a circular base for supporting the lamp and the shields hereinafter described. The circular portion of the ribs I3 supports a lamp I5 having a cap I6 attached thereto to deiiect the air around the lamp. Also the electrical connections to the lamp extend through this cap I6.

Within the lamp housing I2 and spaced from the lamp l5 is a tubular member II having a ilared base I8 which rests on the ribs I3. The inner face of this tubular member is coated with a dull black paint to absorb the radiated heat from the lamp I5, thus preventing the heat from rebounding into the lamp I5 which would intensify its own heat.

The outer surface I 9 of this tubular member is coated with a mirror-like finish and is provided with pins 20 to space the sleeve I'I from a second sleeve 2 I, which has fiared upper and lower ends 22 and 23. This second sleeve also rests on the ribs I3, and has bent out portions 24 at its upper circumference to rest against the housing I2. The inner surface of this second sleeve is of a mirror-like finish and the outer surface is of a dull black finish, while the inner surface of the housing I2 is provided with a mirror-like nish.

A grill 25 is arranged in the aperture 2B in the top of the housing and has depending vanes 21 which are angularly positioned for a portion of the length and then drop straight down. These vanes permit the air from the fan to pass through the upper portion of the housing and deiiect the air away from the operator, while the light beams which would normally project from this opening and expand into the room are broken and very little light passes from the top of the housing.

The sleeve I I and the sleeve 2| and the outer housing I2 are provided respectively with apertures 2B, 29 and 30 to permit the light from the lamp I5 to be projected to the condenser lens system 3| for projecting the light to the mechanism of the projector.

A very eiiicient lamp housing is thus created, wherein the air stream passes around the lamp between the sleeves and the housing, and further, by using the light absorbing faces and reecting surfaces of the sleeves and housing, considerable volume of the heat generated by the lamp is retained in the area of the sleeves and carried off by the air stream preventing the lamp from overheating or the outer housing from becoming too hot to touch.

Having thus fully described my invention, what I claim as new and desire to secure by Letters Patent, is:

1. A lamp housing for a projection device comprising a corrugated housing attached to said projection device, a lamp holder of a web-like structure extending from said projection device into said housing, a lamp in said holder, a sleeve spaced from said lamp and supported on said web-like structure and provided with a heat absorbing inner iinish and a heat reflecting outer prising a corrugated housing attached to said projection device, a lamp holder of a Web-like structure extending from said projection device into said housing, a lamp inl said holder, a,v sleeve spaced from said lamp supported on said Web- 10. 2. A lamp housing for a projection device com'- 4 ing finish, said corrugated housing having a heat reflecting inner surface. @and projections on said second named sleeve for positioning said second named said sleeves in spaced relation within said housing, and deectors in the top of said housing for deecting the heat and light rays.

DON CANADY.

REFERENCES CITED .The following references are of record in the "ile of this patent:

like structure and provided-with a heat absorbf L ing inner nish and a heat reecting outer.,sur--v K lface, a second sleeve spaced from and about said lirst named sleeve by==n1eans of pins extending from one of said sleevesan'd supp'sorted'on-5A said Web-like structure and provided With'an'inner Thea-t Vreecting surface and an outer heat labscrb- UNITED STATES PATENTS Number Name Date 1,160,764 Robinson et al. Nov. 16, 1915 1,298,770 Mould Apr. 1, 1919 i 1,845,214- Arrou'sex Feb, 16, 1932 2,048,214 Howell et al. July 21, 1936 '2,101,638 Brenkert Dec. 7, 1937 2,257,232 Flint et al. Sept. 30, 1941 12,312,561"- Lenai'd- Mar. 2,' 1943 

